Method for injection-molding a propeller fan
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United States of America Patent
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Jan 28, 2003
Grant Date -
Jul 11, 2002
app pub date -
Jan 11, 2001
filing date -
Jan 11, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for injection-molding a plastics propeller fan by using a fixed-side mold section and movable-side mold section, comprises the steps of providing a movable core at an area corresponding to a thicker portion of a blade section of the propeller fan; after a predetermined amount of plastics material has been injected into a blade space of a mold cavity defined by the fixed-side mold section, movable-side metal section and movable core and conforming to the propeller fan, pushing out the movable core into the mold cavity and, after this step, bringing the movable core back to a normal position conforming to a mold shape defining the blade space and forming a proper fan.
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